The golden (or divine) ratio is a staple of good photography and design. When you’re creating web pages or crafting designs in Photoshop, it could help to have a numerical value to guide your work. This tool can help.

This tool, created by Microsoft’s Senior UX Designer will take the width value of any document you’re working on and calculate the other end of the golden ratio for you. So, for example, you can give the tool your total width of a design and it will give you the corresponding smaller value that’s perfectly aligned with the golden ratio inside. It’s a handy little shortcut if you prefer to strictly adhere to the ratio.